Road scraper



1 Jan, I26 1926.

R. KURTZ ROAD SCRAPER Filed sept. 2', 1921 I'zvv am 22E. jiu/ 71722) Patented Jan. 26,.,1926.

ROBERTO KURTZ, or enanos AIRES, ARGENTINA.

ROAD' 'SCRAPER vApplication filed September 2, 1921. Serial 10.,497,884=.v

To a?? whom it may concern.' .i

Be it known that I, ROBERTO KURTZ, a c1t1 Zen of the Argentine Republic, and'resident of Buenos Aires, Argentine Republic, have invented certain newand useful Improvements in Road Scrapers, of which the following is a specification.l

This invention refers to a simple and elemental apparatus commonly known as .a road scraper, usually` drawn by horses oi'` oxen, guided by a .Worlnnan and used for excavating and transportingsoil. y i The invention hasfor its object certain improvements introduced 4inthe construction of such apparatus, whereby it isV posl sible to obtain theautomatic loading and discharging of same, and at the same time the .scraper is causedto malreautomatically a cut of'uniform depth, thus elfecting an importanteconomy of'. labor, and at the same time diminishing and making more uniform the force exerted by the draft animals'.A f A l A preferred fo'rm lof the invention is illustrated in the accompanying drawings, in Which Fig. 1y is a perspective vieW of the scraper; Figs. 2, 3, 4, 5 and` 6 are-side'elevations in diiierenty operative positions, of the same, and Figs. 7 and 8 are details of the hook'and latch system.

' i Uomructzon.

lThe automatic scraper is 'composedii'iof tivo parts: (l) the scraper Ybody and (2) the frame. i

The scraper body is a box made of iron plates, open'at the top and front. To lthe front part of the bottom platevis lixed a pointed blade J. Fig. l. At the top of both sides.v and ahead of the vertical plane which Xc'ontainsthe centre of gravity of the empty scraper, `areriveted the standards s, s for the boltsf I I" which connect theV body' of the scraper to theframe. Y

The entire body is constructed in such' a lWay 1 that :the centres of gravity ofthe scraper when empty or full will be .situated with relationto the edges of thebottom inf the required conditions of operation which Will be hereinafter explained.

The frame is ieomposed of a structure H Iconsisting .of an iron tube conveniently curved. illhis structure is closed at the 'real' by .Qat .iron piece D which supports a d v.for traction purposes.

Figli.

by means of the small frameA the hook The bolt E traversing two small brackets of the cast iron piece D, serves as an axis for the movement Tof the latch' K.

At the sides of the structure H by means of the brackets d d are fastened the `chains Within. the frame the scraper body` can describe a complete circular rotation and in a'certain relative angularfposition it remains fixed. by vthe hook L engaging the latch 1 i' The rope S when embracing the hook P exerts a pull on the Wholeframe as shown y in.l Fig. 2 and'when it does not embrace the lhookPit exerts a pull on the latch K only, and disengages the hook L vas shown in Y partition.

' 1'.v The transportation of the empty or PATENT f oia=1eloaded scraper..-The rope S being slack, Y

tractionv is lexerted directly on the brackets d' al and since the vertical of the centre of gravity passes behind the edge /tfof the bot-y tom plate, thel scraper is maintained in its normal position, Whichis shownvin Fig. 1;' the scraper slides by friction of the part m,

n of its bottom and may ascend or descend any incline.'y f. n v 2; Loadz'ng.-Pulling the rope S moder- V ately, causes the Whole system to slide by `friction fof the? point o'fythe Vblade'on the soil. 'Thuswhat*occursxis'similarto what would occurwitha plow. ''Point J pene-y trates `in the ground, as shown Figure 2, until .the.'frfonty part of the structure H, which 'f serves` as af stop, y1 touches the ground. The yfront part of thescraper bottom is caused to'. assumeV they horizontal position and will have nolmore tendency to continue penetrating the soil Thus the maximum as shown Fig. 3. g

`It may .be :noted that this maximum depth .depends on" thefpo'sition fof, part H ofi-the frame; "relativelyv to the scraper body, and

`thisposition,`fi1rturn, depends-lon that.. oc- .cupiedlgby-the' hook L. The` hook L mayv be predetermined depth will have' been reached,

loosened, and the scraper assumes the normal position, that is, the position shown in FigT l. The blade Will then` cut on an ascendingincline andY the scrapercomesf'- out to the surface.

Dz'scz-rgvmg.-The driver by means of a lasso stroke7 prevents rope S from embracing the hook P and exerts a directpnll on latch K disengaging hook L as shown in Fig. 4L. The scraper body is now, free to revolve inside the frame and the driver loosens again the rope: S.

Traction Will now be exerted on the bolts l. Assuming WT to bethe Weight of thev Therefore, the scraper turnsf around the edge n` until lthe blade J: penetrates-the soil, and the Whole scraper body is then raised, as shown in dotted linesin Figure 4, and tilted as shown by full lines in Figure 5.

. At this moment theV vertical ofthe centre of*` gravity of thefemptyscraper- Will pass in front of the bolts Tf1", andvthe body"r conT tinuousto turn by the act-ionv of its own Weight until the edge otouches the ground.

It Will be noted thatl latch K is? maintained'open, since it'is4 constructed in such a Way that they under part drags on the ground at-thisz-moment. Thefopen latch K thus leaves free pass for the blade-J5 When the points u u" touchthe gi'ouncb-tliescraper body: continuessgtoy rotate until it assumes the position-shown' in Figu-re.. The frame will have beenraiseth andlatclr K left to its own Weight will. have: closed; Zhen hoolr- L' touchesk the lovver` portion of the latch, itw-ill causelit to assumethe'position of liligure::7, and when it; strikesfthesurface /L causes-ithto closefisuddenlyf.7 This movement of thelatclr Willidependzini speed-on the Aspeedof `that of hook-AL, andf the: closing operation Will` be. automatic Whatever may be. thel'speedfoff rotation of theseraper body.

This system is; also: applicable to'. cases Where there: is no Trider` andthe'worltman who manages-f the scraper-V holds thef reins. RopefS isfisappresseda, v Theffworkmam holding-the-L reins; Walks. behind the fserapen. and:

mounted in the rear of the frame and on the rear of the scraper bodyV and normally holding the scraper in operative position, and a flexible element permanently connected with thev locking and latching element on the frame and temporarily engaged at times with the frame so as to maintain the latching and locking device in engaged position andfacilitate the lifting ofV the frame to cause the scraper body tovexcavate, the flexible element being disengagable from the frame'to release the scraper-body so asfto permit a complete rotation of the scraper body in the frame and insure anv automatic dumping and subsetpuenty latching` of the scraper body in an operative position in the frame.

2. An automatic road scraper as claimed in claim l, in Which the front portion of they framev constitutes ai stop part for engagng the ground when the blade haspenel :1

trated the soil to a predetermined maximum depth'.

3.- An automatic road scraper as claimed in claiml, Whereinthe front portion of the frame constitutes a stop partwhich engages the ground when the blade has penetrated the soil to a predetermined maximum depth andi upon touching the groundV` causes the scraper bladeto assume a horizontal posi'- tion thus establishing a uniform depth of cut.4

1i.V An automatic road scraper; as claimed inclaim: 1, wherein the (iront portion of the frame: consti-tutesa stopl part for engaging the. groundl when the: blade has penetrated the :soil to a Apredetermined maximum depth, and the latchingand flock-ing elementen; the frame being vertically :adj ustable thereon -to determine the depth of penetration of the scraper blader with. the: ground.

Signed ati Buenos Aires, Argentine Republic', this twenty-fifth da-y of July A. D. 192i.. c

ROBERTO KURTZ; 

